Fix turtles not preserving their lock when moving

src/main/java/dan200/computercraft/shared/computer/blocks/TileComputerBase.java

@@ -437,6 +437,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
             label = copy.label;
             on = copy.on;
             startOn = copy.startOn;
+            lockCode = copy.lockCode;
             updateBlock();
         }
         copy.instanceID = -1;